院外活动集团可以用英文表示为"extracurricular activities group"。这个短语来源于英文中"extra"和"curriculum"的拼接，"extra"意为"额外的"，"curriculum"意为"课程"。因此，院外活动集团指的是学校课程以外的活动。例句：

The extracurricular activities group offers a wide range of activities for students to participate in outside of class.（院外活动集团为学生提供了多种课外活动。）
I joined the extracurricular activities group to learn more about photography.（我加入了院外活动集团学习更多关于摄影的知识。）
The extracurricular activities group provides a great opportunity for students to explore their interests and develop new skills.（院外活动集团为学生提供了探索兴趣和发展新技能的机会。）